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If you drive it mostly between 35 and 45, it can average very high. I can keep it over 50 without much trouble, and I've kept it over sixty for about a hundred miles. But that's driving carefully, and ignoring very irate streams of traffic on your bumper (or sticking to back streets). Basically you can accelerate very slowly, keeping the engine from coming on, and can run on battery for a long time.
Stop and go is worst. The worst mileage on this (or any) car is on acceleration, and you accelerate more in stop and go. The electric boost works until about 5 mph, then kicks off, usually. Also, if you are running AC or lights and stereo, you are draining the battery, so the engine has to kick in sometimes.
Hills are also bad.
The battery recharges when you are coasting or breaking, and drains when you are accelerating. At highway speeds, the gas engine maintains the speed without much work, and can also charge the battery while it is cruising, if you don't go over about 65.
You can outmaunever yourself, too. Because the car runs so well on battery power, you are tempted to try to use battery power all the time. You accelerate slowly, so that the engine doesn't kick in. You can drive it around 35 for a while with only battery, if you are careful. The problem comes in when you've drained the battery down to where the engine has to kick in. You tend to want to get back to all battery power, so you drive it slower and slower, and try to coast a lot. So what happens is the car can't charge the battery, since you won't accelerate fast enough. You wind up running more off the engine by trying to run off only battery power.
You have to get used to it, in other words, and notice the patterns. In general, for me, though, I get better in town than on the highways, but I don't have any true stop&go.
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